package cn.achao.csr.gateway.service.impl;

import cn.achao.csr.base.constant.Constants;
import cn.achao.csr.base.constant.RedisKeyConstants;
import cn.achao.csr.base.exception.CaptchaException;
import cn.achao.csr.base.resp.AjaxResult;
import cn.achao.csr.base.utils.CsrBase64Utils;
import cn.achao.csr.base.utils.IdUtils;
import cn.achao.csr.base.utils.StringUtils;
import cn.achao.csr.gateway.config.properties.CaptchaProperties;
import cn.achao.csr.gateway.service.ValidateCodeService;
import cn.achao.csr.redis.service.RedisService;
import com.google.code.kaptcha.Producer;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.FastByteArrayOutputStream;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * 验证码实现处理
 *
 * @author achao
 */
@Service
public class ValidateCodeServiceImpl implements ValidateCodeService {
    private static final Logger log = LoggerFactory.getLogger(ValidateCodeServiceImpl.class);
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private RedisService redisService;

    @Autowired
    private CaptchaProperties captchaProperties;

    /**
     * 生成验证码
     */
    @Override
    public AjaxResult createCaptcha() throws Exception {
        AjaxResult ajax = AjaxResult.success();
        boolean captchaEnabled = captchaProperties.getEnabled();
        ajax.put("captchaEnabled", captchaEnabled);
        if (captchaEnabled) {
            // 保存验证码信息
            String uuid = IdUtils.simpleUUID();
            String verifyKey = RedisKeyConstants.CAPTCHA_CODE_KEY + uuid;

            String capStr = null, code = null;
            BufferedImage image = null;

            String captchaType = captchaProperties.getType();
            // 生成验证码
            if ("math".equals(captchaType)) {
                String capText = captchaProducerMath.createText();
                capStr = capText.substring(0, capText.lastIndexOf("@"));
                code = capText.substring(capText.lastIndexOf("@") + 1);
                image = captchaProducerMath.createImage(capStr);
            } else if ("char".equals(captchaType)) {
                capStr = code = captchaProducer.createText();
                image = captchaProducer.createImage(capStr);
            }

            redisService.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
            // 转换流信息写出
            FastByteArrayOutputStream os = new FastByteArrayOutputStream();
            try {
                ImageIO.write(image, "jpg", os);
            } catch (IOException e) {
                return AjaxResult.error(e.getMessage());
            }

            ajax.put("uuid", uuid);
            ajax.put("img", CsrBase64Utils.encode(os.toByteArray()));
        }


        return ajax;
    }

    /**
     * 校验验证码
     */
    @Override
    public void checkCaptcha(String code, String uuid) throws CaptchaException {
        log.info("checkCaptcha");
        if (StringUtils.isEmpty(code)) {
            throw new CaptchaException("验证码不能为空");
        }
        String verifyKey = RedisKeyConstants.CAPTCHA_CODE_KEY + StringUtils.nvl(uuid, "");
        String captcha = redisService.getCacheObject(verifyKey);
        if (captcha == null) {
            throw new CaptchaException("验证码已失效");
        }
        redisService.deleteObject(verifyKey);
        if (!code.equalsIgnoreCase(captcha)) {
            throw new CaptchaException("验证码错误");
        }
    }
}
